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          力扣算法-只出现一次的数字
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        <h1 id="只出现一次的数字"><a href="#只出现一次的数字" class="headerlink" title="只出现一次的数字"></a>只出现一次的数字</h1><ul>
<li>一个非空的数组，除了某个元素只出现一次之外，其他元素均出现两次，寻找只出现一次的元素。</li>
<li><a target="_blank" rel="noopener" href="https://leetcode-cn.com/leetbook/read/top-interview-questions/xm0u83">LeetCode原题链接</a></li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> arr1 = [<span class="number">2</span>,<span class="number">2</span>,<span class="number">1</span>]; <span class="comment">// 输出1</span></span><br><span class="line"><span class="keyword">let</span> arr2 = [<span class="number">4</span>,<span class="number">1</span>,<span class="number">2</span>,<span class="number">1</span>,<span class="number">2</span>]; <span class="comment">// 输出4</span></span><br></pre></td></tr></table></figure>

<h2 id="解题"><a href="#解题" class="headerlink" title="解题"></a>解题</h2><ul>
<li>使用”异或”位运算：异或运算的判断逻辑，只要两者相等返回0，只要不相等，则返回自己</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> arr1 = [<span class="number">2</span>,<span class="number">2</span>,<span class="number">1</span>];</span><br><span class="line"><span class="keyword">let</span> arr2 = [<span class="number">4</span>,<span class="number">1</span>,<span class="number">2</span>,<span class="number">1</span>,<span class="number">2</span>];</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">getSingleNumberByXOR</span>(<span class="params">arr</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> result = <span class="number">0</span>;</span><br><span class="line">    arr.forEach(<span class="function"><span class="params">item</span> =&gt;</span> &#123;</span><br><span class="line">        result ^= item;</span><br><span class="line">    &#125;);</span><br><span class="line">    <span class="keyword">return</span> result;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(getSingleNumberByXOR(arr1));</span><br><span class="line"><span class="built_in">console</span>.log(getSingleNumberByXOR(arr2));</span><br></pre></td></tr></table></figure>

<ul>
<li>利用Set数据结构：Set集合的特性，就是容器中值是唯一的，不允许存放相同的值</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">getSingleNumberBySet</span>(<span class="params">arr</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> result = <span class="keyword">new</span> <span class="built_in">Set</span>();</span><br><span class="line">    arr.forEach(<span class="function"><span class="params">item</span> =&gt;</span> &#123;</span><br><span class="line">        <span class="keyword">if</span>(result.has(item))&#123;</span><br><span class="line">            <span class="comment">// 只要存在相同的，就删除</span></span><br><span class="line">            result.delete(item);</span><br><span class="line">        &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">            result.add(item);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;);</span><br><span class="line">    <span class="keyword">return</span> result;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(getSingleNumberByXOR(arr1));</span><br><span class="line"><span class="built_in">console</span>.log(getSingleNumberByXOR(arr2));</span><br></pre></td></tr></table></figure>

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